Add move constructor/assignment for task.hpp

rt/task.hpp

@@ -19,14 +19,24 @@ namespace typon::rt
     Task(std::coroutine_handle<promise_type> coroutine) noexcept : _coroutine(coroutine) {}
 
     Task(const Task &) = delete;
-    Task(Task &&) = delete;
-
     Task & operator=(const Task &) = delete;
-    Task & operator=(Task &&) = delete;
+
+    Task(Task && other) noexcept
+       : _coroutine(std::exchange(other._coroutine, nullptr))
+    {}
+
+    Task & operator=(Task other)
+    {
+      std::swap(_coroutine, other._coroutine);
+      return *this;
+    }
 
     ~Task()
     {
-      _coroutine.destroy();
+      if (_coroutine)
+      {
+        _coroutine.destroy();
+      }
     }
 
     struct promise_type : Result<T>